循環直通X​​ML，然後在SQL

Question

更新XML可變我的XML看起來像FF：

<root> 
    <TemplateQuestion> 
    <Row rfqID="1" rftID="1" questionDesc="Question 1" responseType="1" rfqDisplayOrder="1" deletedBit="0" /> 
    <Row rfqID="2" rftID="1" questionDesc="Question 2" responseType="2" rfqDisplayOrder="2" deletedBit="0" /> 
    <Row rfqID="3" rftID="1" questionDesc="Question 3" responseType="3" rfqDisplayOrder="3" deletedBit="0" /> 
    </TemplateQuestion> 
</root> 

現在我的目標是使rfqID它面前有字母「Q」。所以結果應該像FF：

<root> 
    <TemplateQuestion> 
    <Row rfqID="q1" rftID="1" questionDesc="Question 1" responseType="1" rfqDisplayOrder="1" deletedBit="0" /> 
    <Row rfqID="q2" rftID="1" questionDesc="Question 2" responseType="2" rfqDisplayOrder="2" deletedBit="0" /> 
    <Row rfqID="q3" rftID="1" questionDesc="Question 3" responseType="3" rfqDisplayOrder="3" deletedBit="0" /> 
    </TemplateQuestion> 
</root> 

我實現，通過這樣做：

declare @xml XML 
    set @xml = (select dbo.udfGetXMLVal(1)) 

    declare @nodeCount int 
    declare @i int 
    declare @qid nvarchar(20) 

    set @i = 1 
    select @nodeCount = @xml.value('count(/root/TemplateQuestion/Row/@rfqID)','int') 
    while(@i <= @nodeCount) 
    begin 
    select @qid = x.value('@rfqID[1]', 'VARCHAR(20)') 
    from @xml.nodes('/root/TemplateQuestion/Row[position()=sql:variable("@i")]') e(x) 
    set @qid = 'q' + @qid 
    select @qid 

    Set @xml.modify('replace value of (/root/TemplateQuestion/Row/@rfqID)[1] with sql:variable("@qid")') 

    set @i = @i + 1 
end 

林有這個線路問題：

Set @xml.modify('replace value of (/root/TemplateQuestion/Row/@rfqID)[1] with sql:variable("@qid")') 

我怎樣才能更換[1]給變量@i？當我嘗試使用sql：variable時，我得到了一些字符串文字的錯誤。

任何幫助你可以提供將不勝感激。謝謝

Answer 1

「我怎麼能代替[1]給變量@i我得到一些當我嘗試使用字符串文字時出錯sql:variable「

你可以做這樣的（測試和SQL Server 2008R2作品）：

Set @xml.modify(' 
    replace value of ((/root/TemplateQuestion/Row/@rfqID)[sql:variable("@i")])[1] 
    with sql:variable("@qid") 
') 

Answer 2

快速和骯髒的:-)

SELECT CAST(REPLACE(CAST(@x AS VARCHAR(MAX)),' rftID="',' rftID="q') AS XML); 

而這裏的清潔方法：

DECLARE @x XML='<root> 
    <TemplateQuestion> 
    <Row rfqID="1" rftID="1" questionDesc="Question 1" responseType="1" rfqDisplayOrder="1" deletedBit="0" /> 
    <Row rfqID="2" rftID="1" questionDesc="Question 2" responseType="2" rfqDisplayOrder="2" deletedBit="0" /> 
    <Row rfqID="3" rftID="1" questionDesc="Question 3" responseType="3" rfqDisplayOrder="3" deletedBit="0" /> 
    </TemplateQuestion> 
</root>'; 

SELECT 
(
    SELECT 'q' + R.value('@rfqID','varchar(max)') AS [@rfqID] 
      ,R.value('@rftID','int') AS [@rftID] 
      ,R.value('@questionDesc','varchar(max)') AS [@questionDesc] 
      --other attributes similar  
    FROM @x.nodes('/root/TemplateQuestion/Row') AS A(R) 
    FOR XML PATH('Row'),ROOT('TemplateQuestion'),TYPE 
) 
FOR XML PATH('root');